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	Re: 2019: On this day . . . Mona - Astronomy #931632 10/07/19 08:42 PM Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom Mona - Astronomy OP BellaOnline Editor Modern Day Human OP Mona - Astronomy BellaOnline Editor Modern Day Human Joined: May 2010 Posts: 12,055 Likes: 30 United Kingdom On this day in 1923 - October 5th - Edwin Hubble discovered a Cepheid variable in M31 (the Andromeda Galaxy). Cepheid variable stars, based on the work of Henrietta Leavitt, can be used as distance indicators. Hubble was able to show that M31 was too far away to be an object in our own Galaxy.

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Mona - Astronomy 08/17/19 09:11 AM Re: 2019: On this day . . . Mona - Astronomy 08/18/19 10:04 AM Re: 2019: On this day . . . Mona - Astronomy 08/18/19 10:17 AM Re: 2019: On this day . . . Mona - Astronomy 08/19/19 09:43 AM Re: 2019: On this day . . . Mona - Astronomy 08/19/19 10:06 AM Re: 2019: On this day . . . Mona - Astronomy 08/20/19 09:30 AM Re: 2019: On this day . . . Mona - Astronomy 08/20/19 09:45 AM Re: 2019: On this day . . . Mona - Astronomy 08/21/19 09:00 AM Re: 2019: On this day . . . Mona - Astronomy 08/22/19 08:34 AM Re: 2019: On this day . . . Mona - Astronomy 08/23/19 09:01 AM Re: 2019: On this day . . . Angie 08/23/19 07:24 PM Re: 2019: On this day . . . Mona - Astronomy 08/24/19 09:21 AM Re: 2019: On this day . . . Mona - Astronomy 08/25/19 08:59 AM Re: 2019: On this day . . . Mona - Astronomy 08/25/19 09:17 AM Re: 2019: On this day . . . Mona - Astronomy 08/25/19 09:19 AM Re: 2019: On this day . . . Mona - Astronomy 08/26/19 08:39 AM Re: 2019: On this day . . . Mona - Astronomy 08/27/19 09:29 AM Re: 2019: On this day . . . Mona - Astronomy 08/28/19 07:00 AM Re: 2019: On this day . . . Mona - Astronomy 08/29/19 08:02 AM Re: 2019: On this day . . . Mona - Astronomy 08/30/19 03:22 PM Re: 2019: On this day . . . Mona - Astronomy 08/31/19 09:18 AM Re: 2019: On this day . . . Mona - Astronomy 09/01/19 08:30 AM Re: 2019: On this day . . . Mona - Astronomy 09/02/19 07:31 AM Re: 2019: On this day . . . Mona - Astronomy 09/04/19 02:50 PM Re: 2019: On this day . . . Mona - Astronomy 09/05/19 02:06 PM Re: 2019: On this day . . . Mona - Astronomy 09/06/19 03:36 PM Re: 2019: On this day . . . Mona - Astronomy 09/07/19 01:10 PM Re: 2019: On this day . . . Mona - Astronomy 09/07/19 01:59 PM Re: 2019: On this day . . . Mona - Astronomy 09/08/19 04:41 PM Re: 2019: On this day . . . Mona - Astronomy 09/09/19 02:38 PM Re: 2019: On this day . . . Mona - Astronomy 09/09/19 02:43 PM Re: 2019: On this day . . . Mona - Astronomy 09/10/19 03:47 PM Re: 2019: On this day . . . Mona - Astronomy 09/10/19 03:50 PM Re: 2019: On this day . . . Mona - Astronomy 09/10/19 03:56 PM Re: 2019: On this day . . . Mona - Astronomy 09/11/19 01:30 PM Re: 2019: On this day . . . Mona - Astronomy 09/11/19 03:44 PM Re: 2019: On this day . . . Mona - Astronomy 09/11/19 03:44 PM Re: 2019: On this day . . . Mona - Astronomy 09/12/19 03:13 PM Re: 2019: On this day . . . Mona - Astronomy 09/12/19 03:15 PM Re: 2019: On this day . . . Mona - Astronomy 09/13/19 09:31 PM Re: 2019: On this day . . . Mona - Astronomy 09/14/19 07:03 PM Re: 2019: On this day . . . Mona - Astronomy 09/15/19 04:38 PM Re: 2019: On this day . . . Mona - Astronomy 09/16/19 04:12 PM Re: 2019: On this day . . . Mona - Astronomy 09/17/19 01:36 PM Re: 2019: On this day . . . Mona - Astronomy 09/18/19 05:11 AM Re: 2019: On this day . . . Mona - Astronomy 09/18/19 05:19 AM Re: 2019: On this day . . . Mona - Astronomy 09/19/19 05:17 PM Re: 2019: On this day . . . Mona - Astronomy 09/19/19 05:31 PM Re: 2019: On this day . . . Mona - Astronomy 09/20/19 09:36 AM Re: 2019: On this day . . . Mona - Astronomy 09/20/19 09:36 AM Re: 2019: On this day . . . Mona - Astronomy 09/21/19 05:44 AM Re: 2019: On this day . . . Mona - Astronomy 09/21/19 10:04 AM Re: 2019: On this day . . . Mona - Astronomy 09/24/19 12:03 PM Re: 2019: On this day . . . Mona - Astronomy 09/24/19 12:13 PM Re: 2019: On this day . . . Mona - Astronomy 09/24/19 12:19 PM Re: 2019: On this day . . . Mona - Astronomy 09/24/19 12:25 PM Re: 2019: On this day . . . Mona - Astronomy 09/25/19 09:15 AM Re: 2019: On this day . . . Mona - Astronomy 09/25/19 09:21 AM Re: 2019: On this day . . . Mona - Astronomy 09/25/19 09:23 AM Re: 2019: On this day . . . Mona - Astronomy 09/26/19 06:47 AM Re: 2019: On this day . . . Mona - Astronomy 09/26/19 06:56 AM Re: 2019: On this day . . . Mona - Astronomy 09/27/19 08:59 PM Re: 2019: On this day . . . Mona - Astronomy 09/28/19 11:00 AM Re: 2019: On this day . . . Mona - Astronomy 09/29/19 06:41 AM Re: 2019: On this day . . . Mona - Astronomy 09/30/19 06:48 PM Re: 2019: On this day . . . Mona - Astronomy 10/01/19 08:22 PM Re: 2019: On this day . . . Mona - Astronomy 10/01/19 08:24 PM Re: 2019: On this day . . . Mona - Astronomy 10/02/19 03:43 AM Re: 2019: On this day . . . Mona - Astronomy 10/03/19 06:43 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:26 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:28 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:34 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:36 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 12:42 AM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 01:02 PM Re: 2019: On this day . . . Mona - Astronomy 10/08/19 01:05 PM Re: 2019: On this day . . . Angie 10/08/19 07:21 PM Re: 2019: On this day . . . Mona - Astronomy 10/09/19 02:59 PM Re: 2019: On this day . . . Mona - Astronomy 10/09/19 03:08 PM Re: 2019: On this day . . . Mona - Astronomy 10/10/19 08:34 AM Re: 2019: On this day . . . Mona - Astronomy 10/10/19 08:37 AM Re: 2019: On this day . . . Mona - Astronomy 10/11/19 10:51 AM Re: 2019: On this day . . . Mona - Astronomy 10/12/19 11:44 AM Re: 2019: On this day . . . Mona - Astronomy 10/13/19 11:31 PM Re: 2019: On this day . . . Mona - Astronomy 10/14/19 12:28 AM Re: 2019: On this day . . . Mona - Astronomy 10/14/19 12:31 AM Re: 2019: On this day . . . Mona - Astronomy 10/15/19 10:53 AM Re: 2019: On this day . . . Mona - Astronomy 10/15/19 10:53 AM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:03 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:06 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:12 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:15 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:17 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:20 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:23 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:25 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:30 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:34 PM Re: 2019: On this day . . . Mona - Astronomy 10/23/19 04:38 PM Re: 2019: On this day . . . Mona - Astronomy 10/24/19 08:41 PM Re: 2019: On this day . . . Mona - Astronomy 10/24/19 08:48 PM Re: 2019: On this day . . . Mona - Astronomy 10/24/19 08:50 PM Re: 2019: On this day . . . Mona - Astronomy 10/25/19 09:06 AM Re: 2019: On this day . . . Mona - Astronomy 10/25/19 09:09 AM Re: 2019: On this day . . . Mona - Astronomy 10/26/19 10:58 AM Re: 2019: On this day . . . Mona - Astronomy 10/27/19 01:28 PM Re: 2019: On this day . . . Mona - Astronomy 10/27/19 01:33 PM Re: 2019: On this day . . . Mona - Astronomy 10/28/19 01:24 PM Re: 2019: On this day . . . Mona - Astronomy 10/29/19 08:20 PM Re: 2019: On this day . . . Mona - Astronomy 10/30/19 02:54 PM Re: 2019: On this day . . . Mona - Astronomy 10/31/19 01:55 PM Re: 2019: On this day . . . Mona - Astronomy 11/01/19 01:14 PM Re: 2019: On this day . . . Mona - Astronomy 11/02/19 02:27 PM Re: 2019: On this day . . . Mona - Astronomy 11/02/19 02:30 PM Re: 2019: On this day . . . Mona - Astronomy 11/03/19 03:28 PM Re: 2019: On this day . . . Mona - Astronomy 11/03/19 03:33 PM Re: 2019: On this day . . . Mona - Astronomy 11/04/19 09:57 AM Re: 2019: On this day . . . Mona - Astronomy 11/05/19 04:08 PM Re: 2019: On this day . . . Mona - Astronomy 11/06/19 10:13 AM Re: 2019: On this day . . . Mona - Astronomy 11/06/19 10:25 AM Re: 2019: On this day . . . Mona - Astronomy 11/07/19 09:10 PM Re: 2019: On this day . . . Mona - Astronomy 11/08/19 09:54 AM Re: 2019: On this day . . . Mona - Astronomy 11/08/19 10:00 AM Re: 2019: On this day . . . Mona - Astronomy 11/09/19 03:31 PM Re: 2019: On this day . . . Mona - Astronomy 11/12/19 06:07 AM Re: 2019: On this day . . . Mona - Astronomy 11/12/19 06:08 AM Re: 2019: On this day . . . Mona - Astronomy 11/12/19 06:14 AM Re: 2019: On this day . . . Mona - Astronomy 11/12/19 06:25 AM Re: 2019: On this day . . . Mona - Astronomy 11/13/19 08:40 AM Re: 2019: On this day . . . Mona - Astronomy 11/14/19 08:12 AM Re: 2019: On this day . . . Mona - Astronomy 11/14/19 08:18 AM Re: 2019: On this day . . . Mona - Astronomy 11/15/19 07:18 AM Re: 2019: On this day . . . Mona - Astronomy 11/15/19 07:21 AM Re: 2019: On this day . . . Mona - Astronomy 11/15/19 09:01 PM Re: 2019: On this day . . . Mona - Astronomy 11/19/19 06:43 AM Re: 2019: On this day . . . Mona - Astronomy 11/19/19 06:47 AM Re: 2019: On this day . . . Mona - Astronomy 11/19/19 06:50 AM Re: 2019: On this day . . . Angie 11/19/19 08:12 PM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 08:51 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 08:53 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 08:57 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 09:00 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 09:03 AM Re: 2019: On this day . . . Mona - Astronomy 11/20/19 03:59 PM Re: 2019: On this day . . . Mona - Astronomy 11/21/19 08:43 AM Re: 2019: On this day . . . Mona - Astronomy 11/22/19 08:13 AM Re: 2019: On this day . . . Mona - Astronomy 11/22/19 08:17 AM Re: 2019: On this day . . . Mona - Astronomy 11/23/19 07:25 AM Re: 2019: On this day . . . Mona - Astronomy 11/24/19 06:21 AM Re: 2019: On this day . . . Mona - Astronomy 11/25/19 09:11 AM Re: 2019: On this day . . . Mona - Astronomy 11/26/19 05:37 AM Re: 2019: On this day . . . Mona - Astronomy 11/27/19 02:35 PM Re: 2019: On this day . . . Mona - Astronomy 11/28/19 11:41 AM Re: 2019: On this day . . . Mona - Astronomy 11/29/19 10:59 AM Re: 2019: On this day . . . Mona - Astronomy 11/30/19 11:35 AM Re: 2019: On this day . . . Mona - Astronomy 11/30/19 04:28 PM Re: 2019: On this day . . . Mona - Astronomy 12/01/19 10:36 AM Re: 2019: On this day . . . Mona - Astronomy 12/02/19 09:48 AM Re: 2019: On this day . . . Mona - Astronomy 12/02/19 09:52 AM Re: 2019: On this day . . . Mona - Astronomy 12/03/19 03:43 PM Re: 2019: On this day . . . Mona - Astronomy 12/04/19 09:21 AM Re: 2019: On this day . . . Mona - Astronomy 12/04/19 09:54 AM Re: 2019: On this day . . . Mona - Astronomy 12/05/19 01:48 PM Re: 2019: On this day . . . Mona - Astronomy 12/05/19 01:51 PM Re: 2019: On this day . . . Mona - Astronomy 12/06/19 08:40 AM Re: 2019: On this day . . . Mona - Astronomy 12/06/19 08:47 AM Re: 2019: On this day . . . Mona - Astronomy 12/07/19 08:56 AM Re: 2019: On this day . . . Mona - Astronomy 12/07/19 08:59 AM Re: 2019: On this day . . . Mona - Astronomy 12/08/19 09:02 AM Re: 2019: On this day . . . Mona - Astronomy 12/09/19 06:49 AM Re: 2019: On this day . . . Mona - Astronomy 12/10/19 04:20 AM Re: 2019: On this day . . . Mona - Astronomy 12/11/19 09:17 AM Re: 2019: On this day . . . Mona - Astronomy 12/12/19 08:16 AM Re: 2019: On this day . . . Mona - Astronomy 12/12/19 08:19 AM Re: 2019: On this day . . . Mona - Astronomy 12/14/19 07:49 AM Re: 2019: On this day . . . Mona - Astronomy 12/15/19 09:56 AM Re: 2019: On this day . . . Mona - Astronomy 12/16/19 09:52 AM Re: 2019: On this day . . . Mona - Astronomy 12/17/19 02:16 PM Re: 2019: On this day . . . Mona - Astronomy 12/18/19 11:25 AM Re: 2019: On this day . . . Mona - Astronomy 12/19/19 10:16 AM Re: 2019: On this day . . . Mona - Astronomy 12/20/19 11:10 AM Re: 2019: On this day . . . Mona - Astronomy 12/21/19 10:28 AM Re: 2019: On this day . . . Mona - Astronomy 12/21/19 10:30 AM Re: 2019: On this day . . . Mona - Astronomy 12/22/19 12:06 PM Re: 2019: On this day . . . Mona - Astronomy 12/23/19 09:49 AM Re: 2019: On this day . . . Mona - Astronomy 12/24/19 11:06 AM Re: 2019: On this day . . . Mona - Astronomy 12/24/19 04:39 PM Re: 2019: On this day . . . Mona - Astronomy 12/25/19 10:41 AM Re: 2019: On this day . . . Mona - Astronomy 12/25/19 10:44 AM Re: 2019: On this day . . . Mona - Astronomy 12/26/19 11:43 AM Re: 2019: On this day . . . Mona - Astronomy 12/27/19 07:33 PM Re: 2019: On this day . . . Mona - Astronomy 12/28/19 10:13 AM Re: 2019: On this day . . . Mona - Astronomy 12/29/19 12:07 PM Re: 2019: On this day . . . Mona - Astronomy 12/30/19 09:00 AM Re: 2019: On this day . . . Mona - Astronomy 12/31/19 11:00 AM